Crossword Genius

Outrageous IBM lark shakes establishment (4,3)

Ross

I believe the answer is:

milk bar

'shakes establishment' is the definition.
(somewhere that sells milkshakes)

'outrageous ibm lark' is the wordplay.
'outrageous' indicates an anagram (I've seen this in other clues).
'ibm'+'lark'='ibmlark'
'ibmlark' anagrammed gives 'MILK-BAR'.

I've seen this clue in The Times.
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